You know, if I had tried doing all this 20 years ago, I'd be able to read it once and I'd know it. After sitting here for hours reading tons of threads, I basically feel like I'm experiencing advanced Alzheimers. So, I'm candling early. I set them Monday. Hey, it's tough to hold out. So out of 8 eggs, I found 2 definite embryos with spider veins. 1 was dropped and frankly I have no idea what the hell I was looking at with that one. As for the rest, all but maybe 1 seemed to show a very well defined air sac. The question I had, and that was probably answered in at least 74 threads I read, is...does air sac mean development of some kind? Or will there be an air sac after a period of time even after sitting on my counter waiting to be fried? I'm not looking at tossing anything yet, it's too early, and it's my first time. So I'll wait. But other than the obvious spidering and embryo, is the air sac a sign of anything?